fix #9970: take correct glyph for mdash
usermanual: use en-dash instead of em-dash; all in all this looks better to my eyes
usermanual: fix a bunch of xml bugs
changed space in front of en dashes to non-breaking space.
cleaned up unclear/awkward phrasing. replaced developer jargon like 'substring'.
Merge pull request #572 from Terrycloth/clarifying-text-in-user-manual

Fourth batch of edits to user manual.
Hopefully fix some minor memleaks
Fix the crops for the FZ series Panasonics
Fix another minor memleak

This is untested as I don't have a camera handy to run that code. No
risk, no fun.
Remove unneeded strlen()
Merge pull request #573 from pedrocr/fix-panasonic-crops

Fix the crops for the FZ series Panasonics
Updated Dutch translation
Merge pull request #575 from MRIG/master

Updated Dutch translation
Revert "Fix another minor memleak"

This crashes dt and/or create imported directory with garbage in it.

This reverts commit 1b00882e44f378d7eeaed7389efe53d569aadcea.
Partly revert : 166660917a2c105658ca2a586e384ec131085f47

As this crashed dt during import from camera.
Update French translation.